package chapter_seventeen.text246;

/**
 * Data time:2021/11/8 16:11
 * StudentID:2019112118
 * Author:hgw
 * Description: 充当抽象命令类
 */
public abstract class AbstractCommand {
    public abstract int execute(int value); //声明命令执行方法 execute()
    public abstract int undo();         //声明撤销方法 undo()
}
